#include <stdio.h>
int main()
{
  char ch;
  scanf("%c",&ch);
  //ch=(ch>='A' && ch<='Z') ? (ch+32) : ch;
  if (ch>='A' && ch<='Z') ch = ch +32;
  
    
  
 
  printf("%c\n",ch);
  return 0;
}
